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@melka
Looking at 90's catalog, I figured that the frame might be a Peugeot Professionnel from around 95, but I can't find pictures clear enough to check for details like the cable guides and the cutouts on the lugs. The frame is 1.979Kg & the fork is 0.781Kg.
I also tested another finish and I think I'll keep it. I sanded the test fork once again to get raw steel, then used some rust "destructor" that might contain phosphoric acid but I can't find the security datasheet to check for composition.
The product make white little bubbles while it gets rid of surface corrosion, and then the steel starts to turn brownish or tan. By wiping it with a rag and applying multiple coats, I can get a nice colour that still shows the underlying metal defects.
On those pictures, I used a semi-gloss clear coat (Montana Tech spray can), but I'll be using glossy 2K clear coat on the final bike.
Now I just need to design the brass inserts and test nitric acid etching followed by brass rod deposition and / or copper plating...